Significats de alkynes en anglès

A variety of substituted alkynes participated in various modes of cycloaddition under Pd-Au alloy catalysis.

We herein report the first example of an electrochemical approach in promoting gold-catalyzed oxidative coupling of terminal alkynes.

Terminal alkynes will react selectively over internal alkynes in all cases examined including both aryl and alkenyl complexes.

Internal and terminal alkynes react with phosphanylalumanes, i. e., P-Al single-bond species, through heating but without any additional additives.

Substituted alkynes are more difficult to insert compared with acetylene, because of the steric repulsion from the additional substituents.

The reaction with two different ferrocene alkynes resulted in the corresponding ferrocene-labeled derivatives, which were obtained in good yield and purity.

The catalysts were tested for the oxidative homocoupling of 1-alkynes to the corresponding diynes in in a combined high throughput and conventional batch reaction approach.

Molecules 30 and 33 are synthesized from 1,3,5-triethynyladamantane by a series of Sonogashira coupling reactions involving terminal alkynes and aryl iodides.

However, in 7 and 8 one or two alkynes are inserted into one of the Co-S bonds to generate 18e species, respectively.

A possible mechanism for the very selective double C-H activation-alkyne coupling is discussed.

The individual azide and alkyne oligonucleotides were synthesized by standard phosphoramidite methods and assembled using a straightforward ligation procedure.

A flexible assembly strategy has been developed for the synthesis of Leishmania donovani GPI anchors that bear a clickable alkyne tag.

An azide was incorporated because this functional group is virtually absent in biological systems and can be reacted by strain-promoted alkyne-azide cycloaddition.

The protocols provided here were formulated for ProSeAM as a profiling reagent but can be applied to other terminal-alkyne-containing SAM analog cofactors.

A variety of substituted alkynes participated in various modes of cycloaddition under Pd-Au alloy catalysis.

We herein report the first example of an electrochemical approach in promoting gold-catalyzed oxidative coupling of terminal alkynes.